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Superior Precision Ana/yr-ica/, Inc. <br /> 1555 Burke, Unit 1 ■ San Francisco, California 94124 ■ (4 15) 647-2081 /fax (4 15) 821-7123 <br /> WESTERN GEO-ENGINEERING Project R603 <br /> Attn: GEORGE CONVERSE Reported 07-October-1993 <br /> EPA SW-846 METHOD 8240 - VOLATILE ORGANICS <br /> Laboratory Number Sample Identification Matrix <br /> 90150- 1 MW-1 Water <br /> 90150- 6 MW-6 Water <br /> RESULTS OF ANALYSIS <br /> Laboratory Number: 90150- 1 90150- 6 <br /> Tetrachloroethene: ND<3 ND<3 <br /> 1, 1, 2, 2-Tetracl-ethane:ND<3 ND<3 <br /> Toluene: ND<3 ND<3 <br /> Chlorobenzene: ND<3 ND<3 <br /> Ethyl Benzene: ND<3 ND<3 <br /> Styrene: ND<3 ND<3 <br /> Xylenes: 50 ND<3 <br /> 1, 3-Dichlorobenzene: ND<3 ND<3 <br /> 1, 4-Dichlorobenzene: ND<3 ND<3 <br /> 1, 2-Dichlorobenzene: ND<3 ND<3 <br /> Concentration: ug/L ug/L <br /> -- Surrogate Recoveries -- <br /> 1, 2-Dichloroethane-d4 : 100% 99% <br /> Toluene-d8 : 302% 100% <br /> Bromofluorobenzene: 106% 98% <br /> Page 3 of 5 <br /> Certified Laboratories <br />